US8957981B2 - Imaging device for capturing self-portrait images - Google Patents

Imaging device for capturing self-portrait images Download PDF

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Publication number
US8957981B2
US8957981B2 US12/716,304 US71630410A US8957981B2 US 8957981 B2 US8957981 B2 US 8957981B2 US 71630410 A US71630410 A US 71630410A US 8957981 B2 US8957981 B2 US 8957981B2
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Prior art keywords
feedback
face
image
view
photographer
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US20110216209A1 (en
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John R. Fredlund
Kenneth A. Parulski
Robert M. Guidash
Kevin E. Spaulding
Frank Razavi
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Monument Peak Ventures LLC
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Intellectual Ventures Fund 83 LLC
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Assigned to EASTMAN KODAK reassignment EASTMAN KODAK ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GUIDASH, ROBERT M., PARULSKI, KENNETH A., RAZAVI, FRANK, SPAULDING, KEVIN E., FREDLUND, JOHN R.
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Priority to PCT/US2011/024993 priority patent/WO2011109168A1/en
Priority to JP2012556093A priority patent/JP5787907B2/ja
Priority to CN201180012070.3A priority patent/CN102783136B/zh
Priority to EP11706981A priority patent/EP2543182A1/de
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Priority to US14/584,175 priority patent/US9462181B2/en
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Definitions

  • This invention pertains to the field of capturing digital images with a portable digital capture device, and more particularly to a digital capture device having modes providing improved usability when held at arm's length to capture images containing the user.
  • Digital cameras have become very common and have largely replaced traditional film cameras.
  • the display screen enables images to be composed as they are being captured, and provides user interface elements for adjusting camera settings.
  • the display screen is also used to browse through images that have been captured and are stored in the digital camera's memory.
  • the user does not receive any visual feedback when the user wishes to be in the field of capture of the camera.
  • a user often desires to capture a photo of himself at a particular venue. This can be accomplished by holding the camera at arm's length and guessing if the camera is pointed in such a manner that the user's face will be in the captured image. This is difficult for many users, and multiple captures are often made to provide a single acceptable one.
  • Another technique is to use the timer mode of the camera. This requires that the camera be placed on a tripod or rigid surface, and the user must scurry from the camera to the field of capture within the time allotted. Most users are unwilling to carry a tripod, and often finding a good surface for placement of the camera is difficult. Additionally, the camera may move when the shutter button is pressed, and since there is no verification that the user is in the field of view of the camera, the image may need to be captured multiple times for the user to be properly captured. There is also the issue of allowing the camera to be placed at a distance from the user when the image is captured. This may be undesirable in crowded venues where theft is a possibility.
  • the Palm Pre cell phone has such a mirror that can be deployed by sliding the backward facing display upward.
  • Cameras can also use a framing apparatus, as described in commonly assigned U.S. Pat. No. 5,565,947.
  • This patent describes how a plurality of thin elements can be arrayed on the front surface of the camera around the lens in general correspondence with the field of view. Framing accuracy is improved for self portraits by canting each element outwardly from the optical axis at such an angle that an inside surface of every element is visible to a subject positioned within the field of view of the lens.
  • this thin framing element also add material and assembly cost, and cannot provide proper results when optical or digital zooming is used.
  • Some cameras such as the Samsung DualView TL220, have provided an additional display on the front of the camera that the user can view while composing the image. While this is an improvement, it adds significant cost to the camera due to the need to incorporate two displays. Additionally, the image is small and can be difficult to see.
  • Some cameras such as the Casio EX-P505, have an articulating display that can be repositioned such that the user can view the scene that is being captured.
  • arrangements of this type add significant cost and, are also fragile since the display is not safely contained within the confines of the camera body.
  • the present invention represents a digital camera for capturing an image containing the photographer, comprising:
  • a processor for processing the output of the image sensor in order to detect the presence of one or more faces in a field of view of the digital camera
  • a feedback mechanism for providing feedback to the photographer while the photographer is included within the field of view, responsive to detecting at least one face in the field of view
  • a means for initiating capture of a digital image of the scene containing the photographer a means for initiating capture of a digital image of the scene containing the photographer.
  • the present invention has the advantage that a user can conveniently determine whether the camera is correctly oriented when it is held at arms length for capturing an image containing the photographer.
  • FIG. 1 is a high-level diagram showing the components of a digital camera system
  • FIG. 2 is a flow diagram depicting typical image processing operations used to process digital images in a digital camera
  • FIG. 3 illustrates a self-portrait photography scenario according to the present invention
  • FIG. 4 is a diagram illustrating one embodiment of a digital camera for implementing the present invention.
  • FIG. 5 is a flowchart showing steps for providing user feedback according to the present invention.
  • FIG. 6 is a flowchart showing additional details for the determine feedback step of FIG. 5 according to one embodiment of the present invention.
  • FIG. 7 illustrates example preferred face zones that are useful for applying composition rules
  • FIG. 8 is a diagram illustrating an alternate embodiment of a digital camera for implementing the present invention using multiple signal lights.
  • a computer program for performing the method of the present invention can be stored in a computer readable storage medium, which can include, for example; magnetic storage media such as a magnetic disk (such as a hard drive or a floppy disk) or magnetic tape; optical storage media such as an optical disc, optical tape, or machine readable bar code; solid state electronic storage devices such as random access memory (RAM), or read only memory (ROM); or any other physical device or medium employed to store a computer program having instructions for controlling one or more computers to practice the method according to the present invention.
  • a computer readable storage medium can include, for example; magnetic storage media such as a magnetic disk (such as a hard drive or a floppy disk) or magnetic tape; optical storage media such as an optical disc, optical tape, or machine readable bar code; solid state electronic storage devices such as random access memory (RAM), or read only memory (ROM); or any other physical device or medium employed to store a computer program having instructions for controlling one or more computers to practice the method according to the present invention.
  • FIG. 1 depicts a block diagram of a digital photography system, including a digital camera 10 .
  • the digital camera 10 is a portable battery operated device, small enough to be easily handheld by a user when capturing and reviewing images.
  • the digital camera 10 produces digital images that are stored as digital image files using image memory 30 .
  • the phrase “digital image” or “digital image file”, as used herein, refers to any digital image file, such as a digital still image or a digital video file.
  • the digital camera 10 captures both motion video images and still images.
  • the digital camera 10 can also include other functions, including, but not limited to, the functions of a digital music player (e.g. an MP3 player), a mobile telephone, a GPS receiver, or a programmable digital assistant (PDA).
  • a digital music player e.g. an MP3 player
  • a mobile telephone e.g. an MP3 player
  • a GPS receiver e.g. a GPS receiver
  • PDA programmable digital assistant
  • the digital camera 10 includes a lens 4 having an adjustable aperture and adjustable shutter 6 .
  • the lens 4 is a zoom lens and is controlled by zoom and focus motor drives 8 .
  • the lens 4 focuses light from a scene (not shown) onto an image sensor 14 , for example, a single-chip color CCD or CMOS image sensor.
  • the lens 4 is one type optical system for forming an image of the scene on the image sensor 14 .
  • the optical system may use a fixed focal length lens with either variable or fixed focus.
  • the output of the image sensor 14 is converted to digital form by Analog Signal Processor (ASP) and Analog-to-Digital (A/D) converter 16 , and temporarily stored in buffer memory 18 .
  • the image data stored in buffer memory 18 is subsequently manipulated by a processor 20 , using embedded software programs (e.g. firmware) stored in firmware memory 28 .
  • firmware e.g. firmware
  • the software program is permanently stored in firmware memory 28 using a read only memory (ROM).
  • the firmware memory 28 can be modified by using, for example, Flash EPROM memory.
  • an external device can update the software programs stored in firmware memory 28 using the wired interface 38 or the wireless modem 50 .
  • the firmware memory 28 can also be used to store image sensor calibration data, user setting selections and other data which must be preserved when the camera is turned off.
  • the processor 20 includes a program memory (not shown), and the software programs stored in the firmware memory 28 are copied into the program memory before being executed by the processor 20 .
  • processor 20 can be provided using a single programmable processor or by using multiple programmable processors, including one or more digital signal processor (DSP) devices.
  • the processor 20 can be provided by custom circuitry (e.g., by one or more custom integrated circuits (ICs) designed specifically for use in digital cameras), or by a combination of programmable processor(s) and custom circuits.
  • ICs custom integrated circuits
  • connectors between the processor 20 from some or all of the various components shown in FIG. 1 can be made using a common data bus.
  • the connection between the processor 20 , the buffer memory 18 , the image memory 30 , and the firmware memory 28 can be made using a common data bus.
  • the image memory 30 can be any form of memory known to those skilled in the art including, but not limited to, a removable Flash memory card, internal Flash memory chips, magnetic memory, or optical memory.
  • the image memory 30 can include both internal Flash memory chips and a standard interface to a removable Flash memory card, such as a Secure Digital (SD) card.
  • SD Secure Digital
  • a different memory card format can be used, such as a micro SD card, Compact Flash (CF) card, MultiMedia Card (MMC), xD card or Memory Stick.
  • the image sensor 14 is controlled by a timing generator 12 , which produces various clocking signals to select rows and pixels and synchronizes the operation of the ASP and A/D converter 16 .
  • the image sensor 14 can have, for example, 12.4 megapixels (4088 ⁇ 3040 pixels) in order to provide a still image file of approximately 4000 ⁇ 3000 pixels. To provide a color image, the image sensor is
  • a color filter array which provides an image sensor having an array of pixels that include different colored pixels.
  • the different color pixels can be arranged in many different patterns.
  • the different color pixels can be arranged using the well-known Bayer color filter array, as described in commonly assigned U.S. Pat. No. 3,971,065, “Color imaging array” to Bayer, the disclosure of which is incorporated herein by reference.
  • the different color pixels can be arranged as described in commonly assigned US patent application number U.S. Patent Application Publication 2007/0024931, filed on Jul. 28, 2007 and titled “Image sensor with improved light sensitivity” to Compton and Hamilton, the disclosure of which is incorporated herein by reference. These examples are not limiting, and many other color patterns may be used.
  • the image sensor 14 , timing generator 12 , and ASP and A/D converter 16 can be separately fabricated integrated circuits, or they can be fabricated as a single integrated circuit as is commonly done with CMOS image sensors. In some embodiments, this single integrated circuit can perform some of the other functions shown in FIG. 1 , including some of the functions provided by processor 20 .
  • the image sensor 14 is effective when actuated in a first mode by timing generator 12 for providing a motion sequence of lower resolution sensor image data which is used when capturing video images and also when previewing a still image to be captured, in order to compose the image.
  • This preview mode sensor image data can be provided as HD resolution image data, for example, with 1280 ⁇ 720 pixels, or as VGA resolution image data, for example, with 640 ⁇ 480 pixels, or using other resolutions which have significantly fewer columns and rows of data, compared to the resolution of the image sensor.
  • the preview mode sensor image data can be provided by combining values of adjacent pixels having the same color, or by eliminating some of the pixels values, or by combining some color pixels values while eliminating other color pixel values.
  • the preview mode image data can be processed as described in commonly assigned U.S. Pat. No. 6,292,218 to Parulski, et al., entitled “Electronic camera for initiating capture of still images while previewing motion images,” which is incorporated herein by reference.
  • the image sensor 14 is also effective when actuated in a second mode by timing generator 12 for providing high resolution still image data.
  • This final mode sensor image data is provided as high resolution output image data, which for scenes having a high illumination level includes all of the pixels of the image sensor, and can be, for example, a 12 megapixel final image data having 4000 ⁇ 3000 pixels.
  • the final sensor image data can be provided by “binning” some number of like-colored pixels on the image sensor, in order to increase the signal level and thus the “ISO speed” of the sensor.
  • the zoom and focus motor drivers 8 are controlled by control signals supplied by the processor 20 , to provide the appropriate focal length setting and to focus the scene onto the image sensor 14 .
  • the exposure level of the image sensor 14 is controlled by controlling the f/number and exposure time of the adjustable aperture and adjustable shutter 6 , the exposure period of the image sensor 14 via the timing generator 12 , and the gain (i.e., ISO speed) setting of the ASP and A/D converter 16 .
  • the processor 20 also controls a flash 2 which can illuminate the scene.
  • the lens 4 of the digital camera 10 can be focused in the first mode by using “through-the-lens” autofocus, as described in commonly-assigned U.S. Pat. No. 5,668,597, entitled “Electronic Camera with Rapid Automatic Focus of an Image upon a Progressive Scan Image Sensor” to Parulski et al., which is incorporated herein by reference.
  • This is accomplished by using the zoom and focus motor drivers 8 to adjust the focus position of the lens 4 to a number of positions ranging between a near focus position to an infinity focus position, while the digital processor 20 determines the closest focus position which provides a peak sharpness value for a central portion of the image captured by the image sensor 14 .
  • the focus distance which corresponds to the closest focus position can then be utilized for several purposes, such as automatically setting an appropriate scene mode, and can be stored as metadata in the image file, along with other lens and camera settings.
  • auxiliary sensor 42 can be used to sense information about the scene or the viewing environment.
  • the auxiliary sensor 42 can be a light sensor for measuring an illumination level of the scene in order to set the proper exposure level.
  • the auxiliary sensor 42 can be an environmental sensor used to characterize the viewing environment in which images are being viewed on an image display 32 .
  • auxiliary sensors 42 can also be used.
  • the processor 20 produces menus and low resolution color images that are temporarily stored in display memory 36 and are displayed on the image display 32 .
  • the image display 32 is typically an active matrix color liquid crystal display (LCD), although other types of displays, such as organic light emitting diode (OLED) displays, can be used.
  • a video interface 44 provides a video output signal from the digital camera 10 to a video display 46 , such as a flat panel HDTV display.
  • preview mode or video mode
  • the digital image data from buffer memory 18 is manipulated by processor 20 to form a series of motion preview images that are displayed, typically as color images, on the image display 32 .
  • the images displayed on the image display 32 are produced using the image data from the digital image files stored in image memory 30 .
  • the graphical user interface displayed on the color LCD image display 32 is controlled in response to user input provided by user controls 34 .
  • the user controls 34 are used to select various camera modes, such as video capture mode, still capture mode, and review mode, and to initiate capture of still images and recording of motion images.
  • the first mode described above i.e. still preview mode
  • the second mode i.e., still image capture mode
  • the user controls 34 are also used to turn on the camera, control the lens 4 , and initiate the picture taking process.
  • User controls 34 typically include some combination of buttons, rocker switches, joysticks, or rotary dials. In some embodiments, some of the user controls 34 are provided by using a touch screen overlay on the image display 32 . In other embodiments, additional status displays or images displays can be used.
  • the camera modes that can be selected using the user controls 34 include a “self portrait” mode, which will be described later with respect to FIG. 4 , and a “timer” mode.
  • a short delay e.g. 10 seconds
  • One or more signal lights 25 on the digital camera 10 can be used to provide visual feedback to the user when a self-portrait is being captured, as will be described later with respect to FIG. 4 .
  • An audio codec 22 connected to the processor 20 receives an audio signal from a microphone 24 and provides an audio signal to a speaker 26 . These components can be to record and playback an audio track, along with a video sequence or still image. If the digital camera 10 is a multi-function device such as a combination camera and mobile phone, the microphone 24 and the speaker 26 can be used for telephone conversation.
  • the speaker 26 can be used as part of the user interface, for example to provide various audible signals which indicate that a user control has been depressed, or that a particular mode has been selected, or to provide feedback to the user when a self-portrait is being captured.
  • the microphone 24 , the audio codec 22 , and the processor 20 can be used to provide voice recognition, so that the user can provide a user input to the processor 20 by using voice commands, rather than user controls 34 .
  • the speaker 26 can also be used to inform the user of an incoming phone call. This can be done using a standard ring tone stored in firmware memory 28 , or by using a custom ring-tone downloaded from a wireless network 58 and stored in the image memory 30 .
  • a vibration device (not shown) can be used to provide a silent (e.g., non audible) notification of an incoming phone call.
  • the processor 20 also provides additional processing of the image data from the image sensor 14 , in order to produce rendered sRGB image data which is compressed and stored within a “finished” image file, such as a well-known Exif-JPEG image file, in the image memory 30 .
  • a “finished” image file such as a well-known Exif-JPEG image file
  • the digital camera 10 can be connected via the wired interface 38 to an interface/recharger 48 , which is connected to a computer 40 , which can be a desktop computer or portable computer located in a home or office.
  • the wired interface 38 can conform to, for example, the well-known USB 2.0 interface specification.
  • the interface/recharger 48 can provide power via the wired interface 38 to a set of rechargeable batteries (not shown) in the digital camera 10 .
  • the digital camera 10 can include a wireless modem 50 , which interfaces over a radio frequency band 52 with the wireless network 58 .
  • the wireless modem 50 can use various wireless interface protocols, such as the well-known Bluetooth wireless interface or the well-known 802.11 wireless interface.
  • the computer 40 can upload images via the Internet 70 to a photo service provider 72 , such as the Kodak EasyShare Gallery. Other devices (not shown) can access the images stored by the photo service provider 72 .
  • the wireless modem 50 communicates over a radio frequency (e.g. wireless) link with a mobile phone network (not shown), such as a 3GSM network, which connects with the Internet 70 in order to upload digital image files from the digital camera 10 .
  • a radio frequency e.g. wireless
  • a mobile phone network not shown
  • 3GSM network which connects with the Internet 70 in order to upload digital image files from the digital camera 10 .
  • These digital image files can be provided to the computer 40 or the photo service provider 72 .
  • FIG. 2 is a flow diagram depicting image processing operations that can be performed by the processor 20 in the digital camera 10 ( FIG. 1 ) in order to process color sensor data 100 from the image sensor 14 output by the ASP and A/D converter 16 .
  • the processing parameters used by the processor 20 to manipulate the color sensor data 100 for a particular digital image are determined by various user settings 175 , which can be selected via the user controls 34 in response to menus displayed on the image display 32 .
  • the color sensor data 100 which has been digitally converted by the ASP and A/D converter 16 is manipulated by a sensor noise reduction step 105 in order to reduce noise from the image sensor 14 .
  • this processing can be performed using the methods described in commonly-assigned U.S. Pat. No. 6,934,056 to Gindele et al., entitled “Noise cleaning and interpolating sparsely populated color digital image using a variable noise cleaning kernel,” the disclosure of which is herein incorporated by reference.
  • the level of noise reduction can be adjusted in response to an ISO setting 110 , so that more filtering is performed at higher ISO exposure index setting.
  • the color image data is then manipulated by a demosaicing step 115 , in order to provide red, green and blue (RGB) image data values at each pixel location.
  • Algorithms for performing the demosaicing step 115 are commonly known as color filter array (CFA) interpolation algorithms or “deBayering” algorithms.
  • CFA color filter array
  • the demosaicing step 115 can use the luminance CFA interpolation method described in commonly-assigned U.S. Pat. No. 5,652,621, entitled “Adaptive color plane interpolation in single sensor color electronic camera,” to Adams et al., the disclosure of which is incorporated herein by reference.
  • the demosaicing step 115 can also use the chrominance CFA interpolation method described in commonly-assigned U.S. Pat. No. 4,642,678, entitled “Signal processing method and apparatus for producing interpolated chrominance values in a sampled color image signal”, to Cok, the disclosure of which is herein incorporated by reference.
  • the user can select between different pixel resolution modes, so that the digital camera can produce a smaller size image.
  • Multiple pixel resolutions can be provided as described in commonly-assigned U.S. Pat. No. 5,493,335, entitled “Single sensor color camera with user selectable image record size,” to Parulski et al., the disclosure of which is herein incorporated by reference.
  • a resolution mode setting 120 can be selected by the user to be full size (e.g. 3,000 ⁇ 2,000 pixels), medium size (e.g. 1,500 ⁇ 1000 pixels) or small size (750 ⁇ 500 pixels).
  • the color image data is color corrected in color correction step 125 .
  • the color correction is provided using a 3 ⁇ 3 linear space color correction matrix, as described in commonly-assigned U.S. Pat. No. 5,189,511, entitled “Method and apparatus for improving the color rendition of hardcopy images from electronic cameras” to Parulski, et al., the disclosure of which is incorporated herein by reference.
  • different user-selectable color modes can be provided by storing different color matrix coefficients in firmware memory 28 of the digital camera 10 . For example, four different color modes can be provided, so that the color mode setting 130 is used to select one of the following color correction matrices:
  • a three-dimensional lookup table can be used to perform the color correction step 125 .
  • the color image data is also manipulated by a tone scale correction step 135 .
  • the tone scale correction step 135 can be performed using a one-dimensional look-up table as described in U.S. Pat. No. 5,189,511, cited earlier.
  • a plurality of tone scale correction look-up tables is stored in the firmware memory 28 in the digital camera 10 . These can include look-up tables which provide a “normal” tone scale correction curve, a “high contrast” tone scale correction curve, and a “low contrast” tone scale correction curve.
  • a user selected contrast setting 140 is used by the processor 20 to determine which of the tone scale correction look-up tables to use when performing the tone scale correction step 135 .
  • the color image data is also manipulated by a face detection/recognition step 185 .
  • face detection can be provided using the methods described in commonly-assigned U.S. Pat. No. 7,583,294, entitled “Face detecting camera and method” to Ray, et al, the disclosure of which is incorporated herein by reference.
  • This patent teaches a method for determining the presence of a face from image data that utilizes a first algorithm to prescreen the image data, by determining a plurality of face candidates utilizing a pattern matching technique that identifies image windows likely to contain faces based on color and shape information, and a second algorithm that processes the face candidates determined by the first algorithm, and uses a posterior probability function classifier to determine the presence of the face.
  • the output of the face detection/recognition step 185 can include metadata that identifies the location of any faces that are detected.
  • the face detection/recognition step 185 can recognize specific faces in images, as described in commonly-assigned U.S. Pat. No. 7,660,445 to Ray, entitled “Method for selecting an emphasis image from an image collection based upon content recognition,” the disclosure of which is incorporated herein by reference.
  • the face recognition step 175 could be used to recognize the face of the user of the digital camera 10 .
  • the output of step 175 can include metadata that identifies the names or other identifiers for specific faces that are detected.
  • the color image data is also manipulated by an image sharpening step 145 .
  • this can be provided using the methods described in commonly-assigned U.S. Pat. No. 6,192,162 entitled “Edge enhancing colored digital images” to Hamilton, et al., the disclosure of which is incorporated herein by reference.
  • the user can select between various sharpening settings, including a “normal sharpness” setting, a “high sharpness” setting, and a “low sharpness” setting.
  • the processor 20 uses one of three different edge boost multiplier values, for example 2.0 for “high sharpness”, 1.0 for “normal sharpness”, and 0.5 for “low sharpness” levels, responsive to a sharpening setting 150 selected by the user of the digital camera 10 .
  • the color image data is also manipulated by an image compression step 155 .
  • the image compression step 155 can be provided using the methods described in commonly-assigned U.S. Pat. No. 4,774,574, entitled “Adaptive block transform image coding method and apparatus” to Daly et al., the disclosure of which is incorporated herein by reference.
  • the user can select between various compression settings. This can be implemented by storing a plurality of quantization tables, for example, three different tables, in the firmware memory 28 of the digital camera 10 . These tables provide different quality levels and average file sizes for the compressed digital image file 180 to be stored in the image memory 30 of the digital camera 10 .
  • a user selected compression mode setting 160 is used by the processor 20 to select the particular quantization table to be used for the image compression step 155 for a particular image.
  • the compressed color image data is stored in a digital image file 180 using a file formatting step 165 .
  • the image file can include various metadata 170 .
  • Metadata 170 is any type of information that relates to the digital image, such as the model of the camera that captured the image, the size of the image, the date and time the image was captured, and various camera settings, such as the lens focal length, the exposure time and f-number of the lens, and whether or not the camera flash fired.
  • all of this metadata 170 is stored using standardized tags within the well-known Exif-WEG still image file format.
  • One common usage for a digital camera 10 is for a photographer 210 to capture a self-portrait image that includes the photographer 210 by holding the digital camera 10 at arms length, pointing it back toward himself.
  • the self-portrait image may contain only one person (i.e., the photographer 210 ). Alternately, the self-portrait image may optionally contain one or more additional persons 220 .
  • an image sensor 14 ( FIG. 1 ) in the digital camera 10 is sensing the scene being imaged onto the image sensor by the lens 4 of the digital camera 10 .
  • a processor within the digital camera processes the output of the image sensor and performs a face detection operation to detect the presence of one or more faces in a field of view of the digital camera 10 .
  • the processor detects the presence of at least one face in the field of view, feedback is provided to the photographer 210 .
  • the photographer 210 can then initiate capturing a digital image using a user control 34 provided for the digital camera 10 .
  • FIG. 4 is a diagram showing additional details of a digital camera 10 incorporating the present invention.
  • An lens 4 is provided to image a scene onto the digital sensor (not shown).
  • the photographer 210 uses one of the user controls 34 ( FIG. 1 ), such as image capture button 240 , to initiate capture of a digital image.
  • Various feedback mechanisms can be used to provide either visual or audio feedback to the photographer.
  • visual feedback can be provided using one or more signal lights 25 and audio feedback can be provided using speaker 26 .
  • the digital camera 10 can also provide feedback using any other feature known to one skilled in the art such as by emitting a light from flash 2 , by displaying text messages or icons on a status display (not shown) on the front of the digital camera 10 , or by causing tactile vibrations of some portion of the digital camera 10 using a vibratory element (not shown).
  • the vibratory element has the advantage of reducing cost in cell phones or other devices that already have such elements for other purposes. The vibration ceases when the image is captured in order to avoid introducing motion blur in the captured image.
  • image capture button 240 can be provided to initiate capturing an image.
  • a remote control, or a voice activation mechanism using microphone 24 can all be used to initiate an image capture event.
  • an existing button (not shown) which is not image capture button 240 can be repurposed to act as the “shutter button” when camera 200 is in self-portrait mode, or a secondary image capture button (not shown) can be included on the digital camera 10 and used in self-portrait mode, in order to provide a user control which can be more easily activated by the photographer 210 when the digital camera 10 is held as shown in FIG. 3 .
  • a time delay is provided between when the user initiates the image capture event and when the digital image is captured, in order to reduce camera vibrations or allow the photographer time to pose.
  • a flowchart showing steps for providing visual or audio feedback to the photographer according to the present invention is shown in FIG. 5 .
  • a capture preview image step 300 is used to capture a preview image 302 of a scene within the field of view of the lens 4 ( FIG. 1 and FIG. 4 ) using the image sensor 14 ( FIG. 1 ) while the digital camera 10 is operating in the first capture mode described earlier in reference to FIG. 1 .
  • the processor 20 is used to process the preview images 302 using a face determination step 305 .
  • the face determination step 305 determines whether the face of the photographer 210 is included in the field of view of the lens 4 , by determining the number and location of any faces in the field of view.
  • this can be done by detecting whether or not at least one face of suitable size is included in the preview image 302 , using face detection methods such as those described earlier with reference to the face detection/recognition step 185 of FIG. 2 . In other embodiments, this can be done by further determining whether or not a detected face is the face of the photographer 210 , using face recognition methods such as those described earlier in reference to the face detection/recognition step 185 of FIG. 2 .
  • the face determination step 305 can further determine whether there are multiple faces of a suitable size within the field of view of the lens 4 , and whether the detected faces are positioned such that no significant portion of the face (e.g. the top portion of the head of additional person 220 ) is located outside of the field of view of the lens 4 .
  • a determine feedback step 310 is used to determine appropriate user feedback 315 responsive to whether one or more faces were detected by the face determination step 305 .
  • the user feedback 315 provided by the determine feedback step 310 may further be responsive to a camera mode 320 or a face distance 325 .
  • the camera mode 320 can be selected by the photographer using user controls 34 as described earlier in reference to FIG. 1 .
  • the face distance 325 can be the lens focus distance, provided using the through-the-lens autofocus method discussed earlier in reference to FIG. 1 .
  • correlation autofocus methods that can be used instead of through-the-lens autofocus, in accordance with the present invention.
  • the face distance 325 can be estimated from the size of the detected faces or the eye spacing relative to the overall size of the image frame together with the focal length of the lens 4 .
  • FIG. 6 is a flow-chart showing additional details for the determine feedback step 310 according to one embodiment of the present invention.
  • the face determination step 305 provides an indication of whether at least one face is present in the field of view of the digital camera.
  • a face present test 400 evaluates the output of the face detection step 305 . If no faces are present, no user feedback 315 is provided to the user. In an alternate embodiment, negative user feedback is provided to the user rather than providing no user feedback.
  • a self-portrait mode test 405 is used to determine whether the digital camera is in a camera mode 320 where user feedback 315 regarding the presence of faces in the digital image is desired. If the camera mode 320 is not a self-portrait mode, no user feedback 415 is provided. In one embodiment of the present invention, user feedback is only provided when the camera mode 320 is set to a special self-portrait camera mode as described earlier with reference to FIG. 1 . In some embodiments no self portrait mode test 405 is used and user feedback 315 is provided independent of the camera mode 320 .
  • a within distance range test 410 determines whether the face distance 325 is within a specified face distance range.
  • a specified face distance range There is a finite range of face distances at which a user can hold a camera at arm's length. For the purpose of example, we will assume that distance is less than one meter. When the camera detects that the face distance is one meter or less, an assumption can be made that the user is holding the camera at arm's length. This assumption will be erroneous for the case where the digital camera is being used for macro photography.
  • the specified face distance range can also include a minimum face distance such as 0.3 meters. If the face distance 325 is within the specified face distance range, no user feedback 415 is provided to the user. Otherwise, positive user feedback 420 is provided indicating that there is at least one face in the field of view of the digital camera.
  • the camera mode 320 for the digital camera when the face distance 325 is detected to be within the specified face distance range, automatically switches to a self-portrait mode. This alleviates the need for the user to explicitly select a self-portrait mode with the user interface. In one variation, the user can use the user interface to indicate whether the self portrait mode should be manually or automatically selected.
  • the determine feedback step 310 can also incorporate other tests in accordance with the present invention. For example, a test can be added which compares a size of the detected face relative to the field of view for the camera to a specified size range that would be expected for self-portraits captured by the photographer holding the camera at arm's length. This test can be helpful to make sure that the digital camera is pointing at the photographer rather than someone in the background.
  • different types of feedback can be provided based on whether a portion of a detected face is located outside of the field of view of the lens 4 and will be cropped when the image is captured by the digital camera 10 .
  • the feedback can be used to help guide the photographer 210 to adjust the position of the digital camera 10 in order to reduce or eliminate this cropping, by ensuring that the user is positioned within a “preferred face zone”.
  • audio suggestions can be provided to “tilt camera up” or “tilt camera left.” These suggestions can also be provided by providing blinking lights or by using text or icons on a status or image display (not shown) on the front of the digital camera 10 , as will be described later.
  • the self-portrait camera mode there may be various camera settings appropriate for use in the self-portrait camera mode. For example, there may be a smallest practical aperture to provide a large depth of field since often, the user will use the self-portrait camera mode to capture an image of himself against a background as a record of his presence in a particular place. The small aperture and associated longer capture time may also be appropriate since in most cases, both the subject and the background will be stationary. However, the use of long exposures must be balanced versus the ability of the user to hold the camera steady. If the camera is equipped with accelerometers or some other ability to sense motion, such as motion analysis of pre-capture video, the time of capture can be automatically adjusted to occur when the camera is determined to be motionless or close to motionless. Additionally, if the camera is so equipped, the flash illumination can be controlled such that the light on the user's face is not unbalanced with that from the remainder of the scene.
  • Another camera setting for the self-portrait camera mode is the use of the wide angle setting when the digital camera 10 has a lens 4 , which is a zoom lens rather than a fixed focal length lens.
  • the user desires a self-portrait with the particular aspects of the location. The user's face should be recognizable, but not dominating the field of capture.
  • the camera In the self-portrait camera mode, the camera should generally be at the lowest magnification setting to maximize the field of view.
  • the user feedback 315 can be provided in many different ways in accordance with the present invention using audio or visual cues.
  • a visual means of indication so that audible indications are not recorded.
  • a signal light 25 such as a light-emitting diode (LED), provided on the front of the camera can light up, or can be caused to blink, to show that the a face has been detected within the image at an appropriate face distance range while the camera is operating in the self-portrait camera mode.
  • LED light-emitting diode
  • the flash 2 can be pulsed to provide the visual feedback. This has the advantage of reducing cost by eliminating the need for an additional signal light 25 .
  • Many other visual signal means can also be used in accordance with the present invention. For example, a small image display could be used to show a low-resolution version of the captured image, however this approach will generally not be desirable because of the added cost that is associated with adding an image display to the digital camera.
  • the visual means of indication can also be used to provide additional information besides simply indicating that a face has been detected within the image.
  • a blink rate for the signal light 25 can be adjusted to provide an indication of the face location within the image.
  • the signal light 25 can be caused to blink more rapidly than when a face is detected at an edge of the image. This can enable the user to make sure that the field of view for the camera is optimally oriented.
  • the preferred face zone can be defined according to various composition rules. For example, if only one face is detected in the field of view, it will generally be desirable to position the face slightly off-center in the field of view according to the well-known “rule of thirds.” This is desirable because it allows the background to be adequately represented in the captured image. This is illustrated in FIG. 7 .
  • two preferred face zones 460 are defined within the digital image 430 which correspond to aesthetically pleasing face locations.
  • a face 440 is detected within one of the preferred face zones 460 , it can be concluded that the photographer 450 is properly positioned relative to a background 470 according to the defined composition rules, thus providing an unobscured view of the background 470 .
  • Different photographers may have different preferences for composition rules. For example, one photographer may prefer images captured using the rule of thirds, while another may prefer images captured with the face centered in the image.
  • a user interface can be provided to allow the photographer to select preferred composition rules.
  • the determine feedback step 310 can select different composition rules depending on the number of faces detected by the face detection step 305 ( FIG. 5 ).
  • a blink duty cycle a signal light color, a signal light intensity or combinations thereof can also be used.
  • Other embodiments would involve using multiple signal lights. For example, one light can be lit when a face is detected within the digital image 430 , and a second light can be lit when the face is within a preferred face zone 460 .
  • the user feedback 315 can also be used to provide an indication of what the photographer must do to improve the composition.
  • three signal lights can be provided in a row as shown in FIG. 8 : a left signal light 500 , a center signal light 510 and a right signal light 520 .
  • the center signal light 510 can be lit.
  • the other signal lights can provide an indication of what direction the user should move the camera to correct the composition.
  • the left signal light 500 can be lit
  • the right signal light 520 can be lit.
  • the left signal light 500 and the right signal light 520 can have an arrow shape pointing in the direction that the photographer needs to reorient the camera. Similar means could be provided to given the photographer an indication of whether the camera needs to be reoriented vertically.
  • the user feedback 315 can also be used to provide an indication of the number of detected faces within the field of view of the camera. This can be useful for the photographer to verify that the camera is oriented properly for group photographs. For example, if the photographer 210 is attempting to capture a photo with additional person 220 as was shown in FIG. 3 , it would be useful to verify that both of the faces fall within the field of view of the camera.
  • a multiple signal light configuration like that shown in FIG. 8 can be used to provide the indication of the number of detected faces. If one face is detected, a single signal light can be lit. Similarly, if two faces are detected, two signal lights can be lit, and if three or more faces are detected, all three signal lights can be lit.
  • a small alphanumeric status display can be provided and a number can be displayed showing the number of detected faces.
  • audio feedback can be provided by using the speaker to provide verbal commands to the user by using voice synthesis or by playing pre-recorded voice commands.
  • non-verbal audio signals can be provided such as playing various tones or sounds responsive to detecting one or more faces in the digital image.
  • the audio feedback mechanisms can also be used to provide additional information beyond whether or not a face has been detected.
  • the speech content of verbal audio signals can be used to provide verbal instructions to the user.
  • verbal instructions can tell the user which direction the camera should be reoriented in order to move the detected faces to positions consistent with defined composition rules.
  • the verbal instructions could indicate the number of faces that are detected within the field of view.
  • additional information can be communicated by adjusting attributes such as the frequency, volume or duty cycle of the audio signals.
  • attributes such as the frequency, volume or duty cycle of the audio signals.
  • the volume of an audio feedback may be raised as the user approaches the preferred composition and stay at a particular high volume until the pointing has changed such that the user is leaving the preferred composition.
  • similar feedback may be provided by means of rising and falling pitch, or by a frequency or duration of a single tone.
  • the patterns of the audio signals can be used to provide an indication of the number of faces that have been detected. For example, if two faces are detected, a characteristic repetitive feedback pattern can be provided such as two blinks or beeps followed by a pause. Additional faces can provide different indication patterns.
  • different audio signals can be used to indicate different conditions, similar to the way cell phones can use different ring tones to indicate different communication events.
  • a user interface can be provided to enable the photographer to select preferred audio signals that are used to indicate different conditions.
  • components that already exist on most digital cameras can be used to provide the user feedback without the need to add any additional components.
  • the digital camera 10 may already incorporate a speaker 26 for providing audible indicators for other reasons, such as for playing back sounds recorded by the digital camera 10 during video mode, or for indicating that image capture has taken place or for indicating error conditions. Therefore, audio feedback can be provided using the existing speaker without requiring any additional component costs.
  • many digital cameras also incorporate pre-existing components that can be used to provide visual indicators. For example, an LED signal light is commonly provided to indicate battery charging. In this case, it would be necessary to position the visual indicator such that it is visible from the front of the camera.
  • the user controls 34 can be used to enable the photographer to select a preferred form of user feedback.
  • menu options can be provided in a user interface that allows the photographer to select between providing visual feedback using signal lights, audio feedback using verbal commands, or audio feedback using non-verbal signals or tactile feedback.
  • the digital camera may be configured to allow multiple sets of preference settings.
  • the face determination step 305 can also be trained to provide an indication of the identity of the detected faces in addition to the number and location of the identified faces, as was described earlier in reference to FIG. 5 . In this case, the identity of the photographer can be inferred from the identified face and the appropriate set of preference settings can be automatically selected.
  • the self-portrait mode can differ from conventional portraiture modes in that there are generally dual subjects of importance.
  • the subject is the face and upper body of a person.
  • the background is generally of secondary importance.
  • both the face of the subject and the background are generally important, and an adequate representation of both should be obtained to attain the desired record of user presence at a location.
  • the digital camera can be automatically changed to a conventional portraiture mode and an indication of this can be provided to the user by any appropriate user feedback mechanism.
  • selection of the self-portrait mode may provide an image capture process where image capture occurs only after specific criteria are met.
  • the user may manually select the self-portrait mode using user controls 34 on the back of the digital camera 10 with the lens 4 pointed away from the photographer 210 .
  • the digital camera 10 captures preview images 302 and processes these preview images 302 until a set of criteria are satisfied.
  • other criteria that could be evaluated would include waiting until all eyes are open, all faces are smiling and camera motion is minimized.
  • the camera can use the aforementioned indicators to alert the photographer 210 that the criteria have been met so that image capture can be manually initiated by the photographer 210 .
  • the digital camera 10 can be configured so that image capture is automatically initiated when all of the criteria have been met.
  • An advantage of providing such an automatic capture mode is that the photographer 210 need not press the image capture button 240 , which can be awkward, and may impart undesirable motion to the digital camera 10 during capture.
  • the portion of the image that is not the face or body of the photographer can be analyzed to provide additional guidance to the photographer as to how the composition of the photograph should be adjusted. For example, even if the face is located within a preferred face zone 460 ( FIG. 7 ), the digital camera may be pointing such that the background is the sky rather than the background of interest. In this case, if the background were determined to have little detail or be largely the color of blue sky, the verbal commands could be provide to the photographer to raise their arm to a higher position in order to change the viewing angle for the camera. The opposite feedback could be provided if it is determined that there is an inadequate sky region in the image.
  • the capture device detects a face distance within that small range of distances, it can be configured to automatically enter the self-portrait mode.
  • the calibration process can be selected by the user or can be initiated during first power up so that the appropriate measurements are taken by the capture device and stored for future reference.
  • this calibration process can be used to train the digital camera 10 to recognize the face of the photographer 210 , so that the self-portrait mode is entered only when the face determination step 305 recognizes the face of the photographer 210 in the preview image 302 captured in capture preview image step 300 .
  • the face detection step 305 ( FIG. 5 ) is adapted to detect animal faces as well as human faces. This can be useful for cases where the photographer may desire to capture a photograph of himself with a favorite pet, or some other animal.
  • the photographer 210 uses the digital camera 10 of the present invention to capture digital still images.
  • the digital camera 10 of the present invention is a digital video camera, or is a digital still camera that also incorporates a video capture mode (i.e. “movie mode”).
  • a video capture mode i.e. “movie mode”.

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EP11706981A EP2543182A1 (de) 2010-03-03 2011-02-16 Abbildungsvorrichtung zur aufnahme von selbstportraitbildern
US14/584,175 US9462181B2 (en) 2010-03-03 2014-12-29 Imaging device for capturing self-portrait images
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US20150116503A1 (en) 2015-04-30
JP2013526099A (ja) 2013-06-20
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WO2011109168A1 (en) 2011-09-09
JP5787907B2 (ja) 2015-09-30
US20160373646A1 (en) 2016-12-22
CN102783136A (zh) 2012-11-14
CN102783136B (zh) 2016-02-10
US9462181B2 (en) 2016-10-04

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